• Restorative Dentistry and Endodontics
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• v.29 no.4
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• pp.365-369
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• 2004

The purpose of this study was to evaluate the apical sealing ability of Super-EBA, MTA and Dyract-flow as retrofilling materials. Forty-eight extracted human teeth with straight and single root canal were used in this study. The root canals were prepared to a #40 apical canal size and obturated with gutter-percha. Apicoectomies were performed and root end cavities were prepared to a depth of 3mm using an ultrasonic device. The root end cavities were filled with Super-EBA, MTA or Dyract-flow. Leakage was measured using an electrochemical technique for 4 weeks. According to this study, the results were as follows. 1. Increasing leakage with time was observed in all groups. 2. No significant difference was noted among the 3 groups with time (p =0.216). 3. No significant difference was noted among the 3 groups when measured within the same time interval (p =0.814). The results of this study suggest that the sealing ability of Dyract-flow is equal to that of Super-EBA and MTA, and Dyract-flow may be an alternative to other materials for root-end filling.

• Proceedings of the KACD Conference
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• 2001.11a
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• pp.588.2-588
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• 2001

The purpose of this study was to compare ultrasonic with sonic root end preparations using anaerobic bacterial leakage model. Forty eight single rooted teeth were instrumented with Profile using crown down technique to .06 black and obturated with GP cone and AH 26 root canal sealer using warm vertical condensation technique. The apical 3mm of each root was resected. The teeth were randomly divided into two experimental groups of 20 teeth each and two control groups of four teeth as follows(omitted)

• Journal of Korean society of Dental Hygiene
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• v.9 no.4
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• pp.864-873
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• 2009

Objectives : This study was to collect data about oral health to develop preschool children' oral health program. Methods : This research was from July 20th to August 20th, 2008 with self-administrated questionnaires by post and e-mail. The response rate was 57.6%(144 of 250). Results : 1. Daycare center provided fruit(64.6%), bread(56.9%), milk(82.6%), yoghurt(47.9%). daycare center tend to provide cariogenic snacks and drinks such as bread, yoghurt. 2. 73.6% of teachers said they reward children with sweets for good behavior. 3. Activities related to oral health was done in daycare center were : children brush their teeth with fluoride toothpaste(79.9%), catering staff receive the education about nutrition(79.2%), children participate in the activities and training related to food(78.5%), using sugary food at a birthday party(77.3%), annual dental health check-up by a dentist(65.3%). 4. The percentages of guiding principles based on documentation in the topic of the oral health were : coping with a situation where a child injured his or her teeth(76.4%), annual dental health checkup by a dentist(72.2%), teachers supervise children's tooth brushing using a fluoride toothpaste(70.8%). 5. Documented guide or course for oral health includes the following; training for coping with tooth damage(76.4%), annual dental health check-up(72.2%), and coaching children to brush their teeth with toothpaste that contains fluoride(70.8%). Conclusions : It is believed that for better children's oral healthcare, childcare teacher should be given a range of in-depth oral health program. Furthermore, through detailed analysis on the documented guide of oral health, cooperation from the associated organization will be required to have the guide placed at the childcare center.

• Proceedings of the KACD Conference
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• 2003.11a
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• pp.577-577
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• 2003

Microcomputed tomography (MCT) made it possible to investigate the morphology of root canals more accurate. The aim of this study was to compare the effects of four root canal shaping methods, the profile system, the ProTaper system, a combination of these, and stainless steel K-files, in the shaping of the mesial root canals of extracted human mandibular first molars, three-dimensionally using MCT. Eight extracted mandibular first molars were scannde using MTC before and after the root cannals were instrumented. Two specimens were prepared using the Profile system and another two specimens were prepared using MCT before and after the root cannals were instrumented. Two specimens were prepared using the Profile system and another two specimens were prepared using the ProTaper system according to manufactures recommendation.(omitted)

• Journal of the Korean Association of Oral and Maxillofacial Surgeons
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• v.36 no.6
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• pp.502-507
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• 2010

Introduction: This study examined the genetic influence of mandibular prognathism epidemiologically in Korean families. Materials and Methods: Over a 5-year period from 2005 to 2009, a questionnaire with a pedigree chart was given to 100 (male 51, female 49) probands with skeletal Class III mandibular prognathism, who had undergone orthognathic surgery in Samsung Medical Center. Results: The average age of the probands was 22.1. The average SNA, SNB and ANB angles of the probands were $81.2^{\circ}$, $84.1^{\circ}$ and $-2.9^{\circ}$, respectively. A total of 2729 (male 1,354, female 1,375) family members were examined, and the affected ratio of the families was 3.5% with no significant difference between genders. 45% of families had at least one member with a Class III malocclusion other than the proband. The affected ratio of the first-degree relatives (10.9%) was significantly higher than those of the second-degree (3.3%) and third-degree (1.9%) relatives. The affected ratio of the total relatives from the male probands (4.2%) was significantly higher than that of the female probands (2.8%). Heritability ($h^2$, Falconer' method) was estimated to be 29.8% ($0.298{\pm}0.059$) in first-degree relatives. Conclusion: These results showed the significant influence of mandibular prognathism with relatively low heritability in first-degree relatives in Korean families of probands, who had undergone orthognathic surgery to correct a skeletal Class III malocclusion.

• Journal of the Korean Academy of Child and Adolescent Psychiatry
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• v.29 no.1
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• pp.26-30
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• 2018

Objectives: To investigate the association of problematic Internet use with oral health behaviors and oral health status in a nationally representative sample of Korean adolescents. Methods: Data from the 2010 Korea Youth Risk Behavior Web-based Survey (73238 Korean adolescents; mean age $15.06{\pm}1.75years$; age range, 12-18 years) were used. Problematic Internet use was measured using the Korean Internet Addiction Proneness Scale for Youth-Short Form. Self-report questionnaires were used to assess oral health behaviors and oral health status of adolescents. Results: Problematic Internet users were less likely to brush their teeth frequently [adjusted odds ratio (AOR)=0.59; 95% confidence interval (CI)=0.56-0.63] and at school after lunch (AOR=0.89; 95% CI=0.83-0.94) as well as more likely to perceive their oral health to be poorer (AOR=1.63, 95% CI=1.54-1.72) and experience oral symptoms (AOR=1.75, 95% CI=1.65-1.86) compared to usual Internet users. Conclusion: The study results indicate that problematic Internet use may adversely affect the oral health of Korean adolescents. Thus, oral health screening and Internet-based education are needed for adolescents experiencing problematic Internet use.

• Journal of Korean society of Dental Hygiene
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• v.18 no.6
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• pp.1079-1090
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• 2018

Objectives: This study aims to provide fundamental data on seeking more effective programs for metabolic syndrome patients' oral health by researching their knowledge, attitude and behaviors on oral health and considering the effects each factor has on the oral health impact profile. Methods: The research was conducted on 155 patients with metabolic syndrome who visited the metabolic syndrome center of S district between July $19^{th}$, 2016 and August 27th, 2016. Results: When the subjects had experiences of oral treatment within the past year, which indicated lower quality of life in relation to oral health. Oral health knowledge had a positive correlation with oral health attitude (0.241) and oral health behaviors (0.362), had a negative correlation with oral health impact profile (-0.283). Oral health attitude showed a positive correlation with oral health behaviors (0.476) (p<0.001). Conclusions: By conducting a oral health promotion business among metabolic syndrome patients including a oral care and treatment program which aim to enhance the oral knowledge, attitude and behaviors and comprehensively manage the oral health education program, it is expected that their quality of life related to oral health could be further improved.

• The Journal of the Korean dental association
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• v.48 no.6
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• pp.443-453
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• 2010

We examined progress in oral health of Korean 5 year olds children and dental public health infrastructure since the National Health Promotion Plan 2010 Oral Health Objectives were issued. We summarize trends in the prevalence of dental caries and trends in national public oral health program activities and budget. The Oral Health Objectives were achieved in 2006. Oral health in Korean preschool children improved considerably by improving of lifestyle and consumption of fluoride containing toothpaste. Although the number of public oral health center and the budget of oral health education were increased, the impact of public oral health program for preschool children was not influential. New oral health program for infants such as fluoride varnish application and strengthening of existing public oral health program should be performed for continuing improvement of oral health in Korea.

• The Journal of Advanced Prosthodontics
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• v.14 no.1
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• pp.1-11
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• 2022

PURPOSE. The maximum width between the mesial and distal labial transitional line angles, described as "esthetic width" herein, could significantly influence the visual perception of the teeth and smile. This study aimed to conduct biometric research on esthetic width and to explore whether regular distribution exists in the esthetic width of human teeth. MATERIALS AND METHODS. A total of 4,264 maxillary and mandibular anterior teeth were measured using the Geomagic studio software program. The proportions of maxillary to mandibular homonymous teeth and proportions between the adjacent teeth were calculated. Bilateral symmetry and the correlation between the esthetic and mesiodistal widths were both accounted for during the measurement procedures. RESULTS. The mean esthetic widths were 6.773 ± 0.518 mm and 4.329 ± 0.331 mm for maxillary and mandibular central incisors, respectively, 5.451 ± 0.487 mm and 5.008 ± 0.351 mm for maxillary and mandibular lateral incisors, respectively, and 3.340 ± 0.353 mm and 5.958 ± 0.415 mm for maxillary and mandibular canines, respectively. Except for the mandibular canines, no significant difference in esthetic width was found among homonymous teeth from the same jaw. A high linear correlation was found between the esthetic and mesiodistal widths of the same tooth, except for the maxillary canines. Esthetic width proportions among different tooth categories showed some regular patterns, which were similar to those of the mesiodistal width. CONCLUSION. Esthetic width is regularly distributed among the teeth in the Chinese population. This could provide an important reference for anterior dental restorations and dimension recovery in esthetic reconstruction of anterior teeth.

• Journal of Korean society of Dental Hygiene
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• v.24 no.3
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• pp.229-242
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• 2024

Objectives: The purpose of this study was to explore and analyze experiences with home-visiting oral health education in vulnerable populations and to provide foundational data necessary for the development of preventive strategies for oral health promotion among these patients. Methods: Using a phenomenological research, in-depth interviews were conducted between August 29 and October 31, 2023 with 20 vulnerable individuals participating in the Home Visit Oral Health Education Program under the Gwangju+ Gwangsan Integrated Care Service project spearheaded by the Gwangju Medical Welfare Cooperative. Results: After analyzing the contents of the participants' experiences, 130 meaningful words and 14 subcategories were identified and categorized into five major themes. Participants expressed discomfort when chewing or swallowing food and felt burdened by visits to the dentist. Although they experienced considerable loneliness because they spent a significant amount of time alone, they enjoyed communicating through visitation care and expressed gratitude for receiving oral health education. Conclusions: Oral health education through home visits cam increase awareness of oral health management among vulnerable populations and serve as an important means of improving their quality of life.